ihealth: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/sbin/ihealth - from package: ipmiutil

You may install the required package with command yum install {package}

Error in other languages:
ihealth: bevel nie gevind nie
ihealth: comandă negăsită
ihealth: comando não encontrado
ihealth: commande introuvable
ihealth: command not found
ihealth: käsku ei ole
ihealth: không tìm thấy lệnh
ihealth: komanda nerasta
ihealth: Kommando nicht gefunden.
ihealth: kommandot finns inte
ihealth: komut yok
ihealth: nie znaleziono polecenia
ihealth: níor aimsíodh an t-ordú
ihealth: no se encontró la orden
ihealth: no s'ha trobat l'ordre
ihealth: opdracht niet gevonden
ihealth: parancs nem található
ihealth: perintah tidak ditemukan
ihealth: príkaz nenájdený
ihealth: příkaz nenalezen
ihealth: команда не найдена
ihealth: командата не е открита
ihealth: 命令找不到
ihealth: コマンドが見つかりません